The Dremel tools are great but they do generate a lot of friction heat and the slab will melt, as will the bits of plastic the tool kicks off. Just be careful to stay away from the card itself with the tool. Go to town on the top of the flip then hand-crack the rest. I usually snap off bits of edge around the corners before trying to crack it open. And goggles are a must even if you wear glasses. You will get shrapnel.
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